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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace TreeViewDrag
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            TreeNode Node = treeView1.SelectedNode;
            TreeNode PrevNode = Node.PrevNode;
            if (PrevNode != null)
            {

                TreeNode NewNode = (TreeNode)Node.Clone();
                if (Node.Parent == null)
                {
                    treeView1.Nodes.Insert(PrevNode.Index, NewNode);
                }
                else
                {
                    Node.Parent.Nodes.Insert(PrevNode.Index, NewNode);
                }
                Node.Remove();
                treeView1.SelectedNode = NewNode;

            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            TreeNode Node = treeView1.SelectedNode;
            TreeNode NextNode = Node.NextNode;
            if (NextNode != null)
            {

                TreeNode NewNode = (TreeNode)Node.Clone();
                if (Node.Parent == null)
                {
                    treeView1.Nodes.Insert(NextNode.Index + 1, NewNode);
                }
                else
                {
                    Node.Parent.Nodes.Insert(NextNode.Index + 1, NewNode);
                }
                Node.Remove();
                treeView1.SelectedNode = NewNode;

            }

        }

        private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                DoDragDrop(e.Item, DragDropEffects.Move);
            }
        }

        private void treeView1_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode"))
            {
                e.Effect = DragDropEffects.Move;
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }

        }

        private void treeView1_DragDrop(object sender, DragEventArgs e)
        {
            TreeNode moveNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");

            //根據(jù)鼠標(biāo)坐標(biāo)確定要移動(dòng)到的目標(biāo)節(jié)點(diǎn)
            Point pt;
            TreeNode targeNode;
            pt = ((TreeView)(sender)).PointToClient(new Point(e.X, e.Y));
            targeNode = this.treeView1.GetNodeAt(pt);

            //如果目標(biāo)節(jié)點(diǎn)無(wú)子節(jié)點(diǎn)則添加為同級(jí)節(jié)點(diǎn),反之添加到下級(jí)節(jié)點(diǎn)的未端
            TreeNode NewMoveNode = (TreeNode)moveNode.Clone();
            if (targeNode.Nodes.Count == 0)
            {
                targeNode.Parent.Nodes.Insert(targeNode.Index, NewMoveNode);
            }
            else
            {
                targeNode.Nodes.Insert(targeNode.Nodes.Count, NewMoveNode);
            }
            //更新當(dāng)前拖動(dòng)的節(jié)點(diǎn)選擇
            treeView1.SelectedNode = NewMoveNode;
            //展開目標(biāo)節(jié)點(diǎn),便于顯示拖放效果
            targeNode.Expand();

            //移除拖放的節(jié)點(diǎn)
            moveNode.Remove();

        }
    }
}